It is fairly safe to say that most Bulle clocks will need their magnet rejuvenated before they will run properly from the normal single 1. 5V cell. The first `real` magnet material was cobalt-chrome steel, in 1921 [ 1 ]. Prior to that, carbon steel was hardened by heating and quenching, and was the basis of most magnets used. Modern magnetic material commenced in around
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1932 with the invention of Al-Ni-Fe (aluminium, nickel, iron) which later became Alnico (aluminium, nickel, cobalt). Alnico was considered a quantum leap above earlier materials. It wasn`t until some time later that today`s really powerful magnetic materials became generally available. So-called rare-earth magnets were not produced commercially until the 1960s, with Samarium-Cobalt being the first offering. The most powerful magnets currently available are neodymium (neodymium-iron-boron, NdFeB) - these were invented in 1983, but were not readily available until some time later - well after Bulle clocks ceased production. [ 2 ] The way any magnet is `charged` is to subject it to an intense magnetic field - the more powerful the field, the better. It is not uncommon to simply wind a coil around the magnet and briefly connect it to a car battery, but this method is fraught with danger. Should the `contact` end of the wire become welded to the battery terminal, the coil and its supply wires will probably melt. The molten metal droplets can cause much damage to feet, arms, hands and the car`s paintwork, and the arc has a very high ultraviolet content and can damage your eyes. As a result (and also because I had almost everything I needed in my junkbox), I decided to put a charger together. Bear in mind that this will be an extremely expensive project if you have to purchase everything new. Even if you can get the bits from...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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